Hello, oh where to start.
I have had 2x Demon furys from lvl 52 i've been able to kill Plant monsters and penguins with ease even great frogs.
I just got lvl 61 and wantes to buy 2x Captains rapiers, after i bought them i want outside pablos and just did 0,0,0 dmg on the great frogs, relogged and tried Plant monsters.
The same thing even with penguins that i could kill with Skull spear / Wooden spear.
I do lower hits on everything then i did with Demon Furys/skull spear.
Now i dont really know how your defense system works. But if the fire damage from demon furys neglect the armor, i still think captains rapier should be able to kill what demon furys can.
So please check on the damage of Captains rapier's and the range when your on it.
Right now the weapon is weaker then a wooden spear.
Best Regards
Z